The Cabinet Secretary Sir Gus O'Donnell will look at the "remaining questions" surrounding Liam Fox and his friendship with friend Adam Werritty.

Questions remain about the defence secretary's dealings with Werritty, despite a strong performance by the defence secretary in the House of Commons on Monday.

Number 10 said on Tuesday: "The Cabinet Secretary is looking at all of these questions. The Cabinet Secretary is addressing the remaining questions. There are a number of questions people have been asking and we want to answer those questions."

But following his statement to MPs, the Ministry of Defence released a list of the 18 overseas visits Fox made where Werritty had been present, as well as listing the dates of 22 times Fox's best man visited him at the ministry.

The timing of the publication meant MPs were unable to question Fox on the details of the trips.

Werritty met Fox in including Dubai, Hong Kong, Singapore and perhaps most controversially joined the defence secretary for a steak dinner with the incoming commander of the Isaf force in Afghanistan, General John Allen.